2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * @(#)parser.c 8.7 (Berkeley) 5/16/95
37 * $FreeBSD: src/bin/sh/parser.c,v 1.106 2011/03/13 20:02:39 jilles Exp $
47 #include "expand.h" /* defines rmescapes() */
59 #include "exec.h" /* to check for special builtins */
61 #include "myhistedit.h"
65 * Shell command parser.
71 /* values of checkkwd variable */
76 /* values returned by readtoken */
82 struct heredoc *next; /* next here document in list */
83 union node *here; /* redirection node */
84 char *eofmark; /* string indicating end of input */
85 int striptabs; /* if set, strip leading tabs */
89 struct parser_temp *next;
94 static struct heredoc *heredoclist; /* list of here documents to read */
95 static int doprompt; /* if set, prompt the user */
96 static int needprompt; /* true if interactive and at start of line */
97 static int lasttoken; /* last token read */
98 MKINIT int tokpushback; /* last token pushed back */
99 static char *wordtext; /* text of last word returned by readtoken */
100 MKINIT int checkkwd; /* 1 == check for kwds, 2 == also eat newlines */
101 static struct nodelist *backquotelist;
102 static union node *redirnode;
103 static struct heredoc *heredoc;
104 static int quoteflag; /* set if (part of) last token was quoted */
105 static int startlinno; /* line # where last token started */
106 static int funclinno; /* line # where the current function started */
107 static struct parser_temp *parser_temp;
110 static union node *list(int, int);
111 static union node *andor(void);
112 static union node *pipeline(void);
113 static union node *command(void);
114 static union node *simplecmd(union node **, union node *);
115 static union node *makename(void);
116 static void parsefname(void);
117 static void parseheredoc(void);
118 static int peektoken(void);
119 static int readtoken(void);
120 static int xxreadtoken(void);
121 static int readtoken1(int, char const *, char *, int);
122 static int noexpand(char *);
123 static void synexpect(int) __dead2;
124 static void synerror(const char *) __dead2;
125 static void setprompt(int);
129 parser_temp_alloc(size_t len)
131 struct parser_temp *t;
134 t = ckmalloc(sizeof(*t));
136 t->next = parser_temp;
138 t->data = ckmalloc(len);
145 parser_temp_realloc(void *ptr, size_t len)
147 struct parser_temp *t;
152 error("bug: parser_temp_realloc misused");
153 t->data = ckrealloc(t->data, len);
160 parser_temp_free_upto(void *ptr)
162 struct parser_temp *t;
166 while (parser_temp != NULL && !done) {
168 parser_temp = t->next;
169 done = t->data == ptr;
175 error("bug: parser_temp_free_upto misused");
180 parser_temp_free_all(void)
182 struct parser_temp *t;
185 while (parser_temp != NULL) {
187 parser_temp = t->next;
196 * Read and parse a command. Returns NEOF on end of file. (NULL is a
197 * valid parse tree indicating a blank line.)
201 parsecmd(int interact)
205 /* This assumes the parser is not re-entered,
206 * which could happen if we add command substitution on PS1/PS2.
208 parser_temp_free_all();
229 list(int nlflag, int erflag)
231 union node *ntop, *n1, *n2, *n3;
234 checkkwd = CHKNL | CHKKWD | CHKALIAS;
235 if (!nlflag && !erflag && tokendlist[peektoken()])
241 if (tok == TBACKGND) {
242 if (n2->type == NCMD || n2->type == NPIPE) {
243 n2->ncmd.backgnd = 1;
244 } else if (n2->type == NREDIR) {
247 n3 = (union node *)stalloc(sizeof (struct nredir));
250 n3->nredir.redirect = NULL;
256 else if (n1 == NULL) {
257 n1 = (union node *)stalloc(sizeof (struct nbinary));
259 n1->nbinary.ch1 = ntop;
260 n1->nbinary.ch2 = n2;
264 n3 = (union node *)stalloc(sizeof (struct nbinary));
266 n3->nbinary.ch1 = n1->nbinary.ch2;
267 n3->nbinary.ch2 = n2;
268 n1->nbinary.ch2 = n3;
281 } else if (tok == TEOF && nlflag) {
287 checkkwd = CHKNL | CHKKWD | CHKALIAS;
288 if (!nlflag && !erflag && tokendlist[peektoken()])
295 pungetc(); /* push back EOF on input */
298 if (nlflag || erflag)
311 union node *n1, *n2, *n3;
316 if ((t = readtoken()) == TAND) {
318 } else if (t == TOR) {
325 n3 = (union node *)stalloc(sizeof (struct nbinary));
327 n3->nbinary.ch1 = n1;
328 n3->nbinary.ch2 = n2;
338 union node *n1, *n2, *pipenode;
339 struct nodelist *lp, *prev;
343 checkkwd = CHKNL | CHKKWD | CHKALIAS;
344 TRACE(("pipeline: entered\n"));
345 while (readtoken() == TNOT)
349 if (readtoken() == TPIPE) {
350 pipenode = (union node *)stalloc(sizeof (struct npipe));
351 pipenode->type = NPIPE;
352 pipenode->npipe.backgnd = 0;
353 lp = (struct nodelist *)stalloc(sizeof (struct nodelist));
354 pipenode->npipe.cmdlist = lp;
358 lp = (struct nodelist *)stalloc(sizeof (struct nodelist));
359 checkkwd = CHKNL | CHKKWD | CHKALIAS;
367 } while (readtoken() == TPIPE);
373 n2 = (union node *)stalloc(sizeof (struct nnot));
387 union node *ap, **app;
388 union node *cp, **cpp;
389 union node *redir, **rpp;
393 checkkwd = CHKNL | CHKKWD | CHKALIAS;
399 /* Check for redirection which may precede command */
400 while (readtoken() == TREDIR) {
401 *rpp = n2 = redirnode;
402 rpp = &n2->nfile.next;
407 switch (readtoken()) {
409 n1 = (union node *)stalloc(sizeof (struct nif));
411 if ((n1->nif.test = list(0, 0)) == NULL)
413 if (readtoken() != TTHEN)
415 n1->nif.ifpart = list(0, 0);
417 while (readtoken() == TELIF) {
418 n2->nif.elsepart = (union node *)stalloc(sizeof (struct nif));
419 n2 = n2->nif.elsepart;
421 if ((n2->nif.test = list(0, 0)) == NULL)
423 if (readtoken() != TTHEN)
425 n2->nif.ifpart = list(0, 0);
427 if (lasttoken == TELSE)
428 n2->nif.elsepart = list(0, 0);
430 n2->nif.elsepart = NULL;
433 if (readtoken() != TFI)
435 checkkwd = CHKKWD | CHKALIAS;
440 n1 = (union node *)stalloc(sizeof (struct nbinary));
441 n1->type = (lasttoken == TWHILE)? NWHILE : NUNTIL;
442 if ((n1->nbinary.ch1 = list(0, 0)) == NULL)
444 if ((got=readtoken()) != TDO) {
445 TRACE(("expecting DO got %s %s\n", tokname[got], got == TWORD ? wordtext : ""));
448 n1->nbinary.ch2 = list(0, 0);
449 if (readtoken() != TDONE)
451 checkkwd = CHKKWD | CHKALIAS;
455 if (readtoken() != TWORD || quoteflag || ! goodname(wordtext))
456 synerror("Bad for loop variable");
457 n1 = (union node *)stalloc(sizeof (struct nfor));
459 n1->nfor.var = wordtext;
460 while (readtoken() == TNL)
462 if (lasttoken == TWORD && ! quoteflag && equal(wordtext, "in")) {
464 while (readtoken() == TWORD) {
465 n2 = (union node *)stalloc(sizeof (struct narg));
467 n2->narg.text = wordtext;
468 n2->narg.backquote = backquotelist;
470 app = &n2->narg.next;
474 if (lasttoken != TNL && lasttoken != TSEMI)
477 static char argvars[5] = {
478 CTLVAR, VSNORMAL|VSQUOTE, '@', '=', '\0'
480 n2 = (union node *)stalloc(sizeof (struct narg));
482 n2->narg.text = argvars;
483 n2->narg.backquote = NULL;
484 n2->narg.next = NULL;
487 * Newline or semicolon here is optional (but note
488 * that the original Bourne shell only allowed NL).
490 if (lasttoken != TNL && lasttoken != TSEMI)
493 checkkwd = CHKNL | CHKKWD | CHKALIAS;
494 if ((t = readtoken()) == TDO)
496 else if (t == TBEGIN)
500 n1->nfor.body = list(0, 0);
501 if (readtoken() != t)
503 checkkwd = CHKKWD | CHKALIAS;
506 n1 = (union node *)stalloc(sizeof (struct ncase));
508 if (readtoken() != TWORD)
510 n1->ncase.expr = n2 = (union node *)stalloc(sizeof (struct narg));
512 n2->narg.text = wordtext;
513 n2->narg.backquote = backquotelist;
514 n2->narg.next = NULL;
515 while (readtoken() == TNL);
516 if (lasttoken != TWORD || ! equal(wordtext, "in"))
517 synerror("expecting \"in\"");
518 cpp = &n1->ncase.cases;
519 checkkwd = CHKNL | CHKKWD, readtoken();
520 while (lasttoken != TESAC) {
521 *cpp = cp = (union node *)stalloc(sizeof (struct nclist));
523 app = &cp->nclist.pattern;
524 if (lasttoken == TLP)
527 *app = ap = (union node *)stalloc(sizeof (struct narg));
529 ap->narg.text = wordtext;
530 ap->narg.backquote = backquotelist;
531 checkkwd = CHKNL | CHKKWD;
532 if (readtoken() != TPIPE)
534 app = &ap->narg.next;
537 ap->narg.next = NULL;
538 if (lasttoken != TRP)
540 cp->nclist.body = list(0, 0);
542 checkkwd = CHKNL | CHKKWD | CHKALIAS;
543 if ((t = readtoken()) != TESAC) {
547 checkkwd = CHKNL | CHKKWD, readtoken();
549 cpp = &cp->nclist.next;
552 checkkwd = CHKKWD | CHKALIAS;
555 n1 = (union node *)stalloc(sizeof (struct nredir));
556 n1->type = NSUBSHELL;
557 n1->nredir.n = list(0, 0);
558 n1->nredir.redirect = NULL;
559 if (readtoken() != TRP)
561 checkkwd = CHKKWD | CHKALIAS;
566 if (readtoken() != TEND)
568 checkkwd = CHKKWD | CHKALIAS;
570 /* Handle an empty command like other simple commands. */
576 * An empty command before a ; doesn't make much sense, and
577 * should certainly be disallowed in the case of `if ;'.
586 n1 = simplecmd(rpp, redir);
592 /* Now check for redirection which may follow command */
593 while (readtoken() == TREDIR) {
594 *rpp = n2 = redirnode;
595 rpp = &n2->nfile.next;
602 n2 = (union node *)stalloc(sizeof (struct nredir));
607 n1->nredir.redirect = redir;
615 simplecmd(union node **rpp, union node *redir)
617 union node *args, **app;
618 union node **orig_rpp = rpp;
619 union node *n = NULL;
622 /* If we don't have any redirections already, then we must reset */
623 /* rpp to be the address of the local redir variable. */
630 * We save the incoming value, because we need this for shell
631 * functions. There can not be a redirect or an argument between
632 * the function name and the open parenthesis.
637 if (readtoken() == TWORD) {
638 n = (union node *)stalloc(sizeof (struct narg));
640 n->narg.text = wordtext;
641 n->narg.backquote = backquotelist;
644 } else if (lasttoken == TREDIR) {
645 *rpp = n = redirnode;
646 rpp = &n->nfile.next;
647 parsefname(); /* read name of redirection file */
648 } else if (lasttoken == TLP && app == &args->narg.next
649 && rpp == orig_rpp) {
650 /* We have a function */
651 if (readtoken() != TRP)
655 * - Require plain text.
656 * - Functions with '/' cannot be called.
658 * - Reject ksh extended glob patterns.
660 if (!noexpand(n->narg.text) || quoteflag ||
661 strchr(n->narg.text, '/') ||
663 n->narg.text[strlen(n->narg.text) - 1]))
664 synerror("Bad function name");
665 rmescapes(n->narg.text);
666 if (find_builtin(n->narg.text, &special) >= 0 &&
668 synerror("Cannot override a special builtin with a function");
670 n->narg.next = command();
680 n = (union node *)stalloc(sizeof (struct ncmd));
684 n->ncmd.redirect = redir;
693 n = (union node *)stalloc(sizeof (struct narg));
696 n->narg.text = wordtext;
697 n->narg.backquote = backquotelist;
702 fixredir(union node *n, const char *text, int err)
704 TRACE(("Fix redir %s %d\n", text, err));
706 n->ndup.vname = NULL;
708 if (is_digit(text[0]) && text[1] == '\0')
709 n->ndup.dupfd = digit_val(text[0]);
710 else if (text[0] == '-' && text[1] == '\0')
715 synerror("Bad fd number");
717 n->ndup.vname = makename();
725 union node *n = redirnode;
727 if (readtoken() != TWORD)
729 if (n->type == NHERE) {
730 struct heredoc *here = heredoc;
736 TRACE(("Here document %d\n", n->type));
737 if (here->striptabs) {
738 while (*wordtext == '\t')
741 if (! noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN)
742 synerror("Illegal eof marker for << redirection");
744 here->eofmark = wordtext;
746 if (heredoclist == NULL)
749 for (p = heredoclist ; p->next ; p = p->next);
752 } else if (n->type == NTOFD || n->type == NFROMFD) {
753 fixredir(n, wordtext, 0);
755 n->nfile.fname = makename();
761 * Input any here documents.
767 struct heredoc *here;
770 while (heredoclist) {
772 heredoclist = here->next;
777 readtoken1(pgetc(), here->here->type == NHERE? SQSYNTAX : DQSYNTAX,
778 here->eofmark, here->striptabs);
779 n = (union node *)stalloc(sizeof (struct narg));
782 n->narg.text = wordtext;
783 n->narg.backquote = backquotelist;
784 here->here->nhere.doc = n;
804 int alreadyseen = tokpushback;
813 if (checkkwd & CHKNL) {
821 * check for keywords and aliases
823 if (t == TWORD && !quoteflag)
825 const char * const *pp;
827 if (checkkwd & CHKKWD)
828 for (pp = parsekwd; *pp; pp++) {
829 if (**pp == *wordtext && equal(*pp, wordtext))
831 lasttoken = t = pp - parsekwd + KWDOFFSET;
832 TRACE(("keyword %s recognized\n", tokname[t]));
836 if (checkkwd & CHKALIAS &&
837 (ap = lookupalias(wordtext, 1)) != NULL) {
838 pushstring(ap->val, strlen(ap->val), ap);
848 TRACE(("token %s %s\n", tokname[t], t == TWORD ? wordtext : ""));
850 TRACE(("reread token %s %s\n", tokname[t], t == TWORD ? wordtext : ""));
857 * Read the next input token.
858 * If the token is a word, we set backquotelist to the list of cmds in
859 * backquotes. We set quoteflag to true if any part of the word was
861 * If the token is TREDIR, then we set redirnode to a structure containing
863 * In all cases, the variable startlinno is set to the number of the line
864 * on which the token starts.
866 * [Change comment: here documents and internal procedures]
867 * [Readtoken shouldn't have any arguments. Perhaps we should make the
868 * word parsing code into a separate routine. In this case, readtoken
869 * doesn't need to have any internal procedures, but parseword does.
870 * We could also make parseoperator in essence the main routine, and
871 * have parseword (readtoken1?) handle both words and redirection.]
874 #define RETURN(token) return lasttoken = token
890 for (;;) { /* until token or start of word found */
896 while ((c = pgetc()) != '\n' && c != PEOF);
900 if (pgetc() == '\n') {
901 startlinno = ++plinno;
912 needprompt = doprompt;
940 return readtoken1(c, BASESYNTAX, NULL, 0);
945 #define MAXNEST_STATIC 8
948 const char *syntax; /* *SYNTAX */
949 int parenlevel; /* levels of parentheses in arithmetic */
950 enum tokenstate_category
953 TSTATE_VAR_OLD, /* ${var+-=?}, inherits dquotes */
954 TSTATE_VAR_NEW, /* other ${var...}, own dquote state */
961 * Called to parse command substitutions.
965 parsebackq(char *out, struct nodelist **pbqlist,
966 int oldstyle, int dblquote, int quoted)
968 struct nodelist **nlpp;
971 struct jmploc jmploc;
972 struct jmploc *const savehandler = handler;
975 const int bq_startlinno = plinno;
976 char *volatile ostr = NULL;
977 struct parsefile *const savetopfile = getcurrentfile();
978 struct heredoc *const saveheredoclist = heredoclist;
979 struct heredoc *here;
982 if (setjmp(jmploc.loc)) {
983 popfilesupto(savetopfile);
988 heredoclist = saveheredoclist;
989 handler = savehandler;
990 if (exception == EXERROR) {
991 startlinno = bq_startlinno;
992 synerror("Error in command substitution");
994 longjmp(handler->loc, 1);
997 savelen = out - stackblock();
999 str = ckmalloc(savelen);
1000 memcpy(str, stackblock(), savelen);
1007 * We must read until the closing backquote, giving special
1008 * treatment to some slashes, and then push the string and
1009 * reread it as input, interpreting it normally.
1014 STARTSTACKSTR(oout);
1020 CHECKSTRSPACE(2, oout);
1021 switch (c = pgetc()) {
1026 if ((c = pgetc()) == '\n') {
1033 * If eating a newline, avoid putting
1034 * the newline into the new character
1035 * stream (via the USTPUTC after the
1040 if (c != '\\' && c != '`' && c != '$'
1041 && (!dblquote || c != '"'))
1042 USTPUTC('\\', oout);
1047 needprompt = doprompt;
1051 startlinno = plinno;
1052 synerror("EOF in backquote substitution");
1061 USTPUTC('\0', oout);
1062 olen = oout - stackblock();
1064 ostr = ckmalloc(olen);
1065 memcpy(ostr, stackblock(), olen);
1066 setinputstring(ostr, 1);
1071 nlpp = &(*nlpp)->next;
1072 *nlpp = (struct nodelist *)stalloc(sizeof (struct nodelist));
1073 (*nlpp)->next = NULL;
1076 saveprompt = doprompt;
1080 n = list(0, oldstyle);
1083 doprompt = saveprompt;
1085 if (readtoken() != TRP)
1092 * Start reading from old file again, ignoring any pushed back
1093 * tokens left from the backquote parsing
1099 CHECKSTRSPACE(savelen + 1, out);
1102 memcpy(out, str, savelen);
1103 STADJUST(savelen, out);
1111 here = saveheredoclist;
1113 while (here->next != NULL)
1115 here->next = heredoclist;
1116 heredoclist = saveheredoclist;
1118 handler = savehandler;
1121 USTPUTC(CTLBACKQ | CTLQUOTE, out);
1123 USTPUTC(CTLBACKQ, out);
1129 * If eofmark is NULL, read a word or a redirection symbol. If eofmark
1130 * is not NULL, read a here document. In the latter case, eofmark is the
1131 * word which marks the end of the document and striptabs is true if
1132 * leading tabs should be stripped from the document. The argument firstc
1133 * is the first character of the input token or document.
1135 * Because C does not have internal subroutines, I have simulated them
1136 * using goto's to implement the subroutine linkage. The following macros
1137 * will run code that appears at the end of readtoken1.
1140 #define CHECKEND() {goto checkend; checkend_return:;}
1141 #define PARSEREDIR() {goto parseredir; parseredir_return:;}
1142 #define PARSESUB() {goto parsesub; parsesub_return:;}
1143 #define PARSEARITH() {goto parsearith; parsearith_return:;}
1146 readtoken1(int firstc, char const *initialsyntax, char *eofmark, int striptabs)
1149 char * volatile out;
1151 char line[EOFMARKLEN + 1];
1152 struct nodelist *bqlist;
1153 volatile int quotef;
1157 struct tokenstate state_static[MAXNEST_STATIC];
1158 int maxnest = MAXNEST_STATIC;
1159 struct tokenstate *state = state_static;
1161 startlinno = plinno;
1166 state[level].syntax = initialsyntax;
1167 state[level].parenlevel = 0;
1168 state[level].category = TSTATE_TOP;
1171 loop: { /* for each line, until end of word */
1172 CHECKEND(); /* set c to PEOF if at end of here document */
1173 for (;;) { /* until end of line or end of word */
1174 CHECKSTRSPACE(4, out); /* permit 4 calls to USTPUTC */
1176 synentry = state[level].syntax[c];
1179 case CNL: /* '\n' */
1180 if (state[level].syntax == BASESYNTAX)
1181 goto endword; /* exit outer loop */
1189 goto loop; /* continue outer loop */
1194 if (eofmark == NULL || initialsyntax != SQSYNTAX)
1195 USTPUTC(CTLESC, out);
1198 case CBACK: /* backslash */
1203 } else if (c == '\n') {
1210 if (state[level].syntax == DQSYNTAX &&
1211 c != '\\' && c != '`' && c != '$' &&
1212 (c != '"' || (eofmark != NULL &&
1213 newvarnest == 0)) &&
1214 (c != '}' || state[level].category != TSTATE_VAR_OLD))
1216 if ((eofmark == NULL ||
1218 state[level].syntax == BASESYNTAX)
1219 USTPUTC(CTLQUOTEMARK, out);
1220 if (SQSYNTAX[c] == CCTL)
1221 USTPUTC(CTLESC, out);
1223 if ((eofmark == NULL ||
1225 state[level].syntax == BASESYNTAX &&
1226 state[level].category == TSTATE_VAR_OLD)
1227 USTPUTC(CTLQUOTEEND, out);
1232 USTPUTC(CTLQUOTEMARK, out);
1233 state[level].syntax = SQSYNTAX;
1236 USTPUTC(CTLQUOTEMARK, out);
1237 state[level].syntax = DQSYNTAX;
1240 if (eofmark != NULL && newvarnest == 0)
1243 if (state[level].category == TSTATE_VAR_OLD)
1244 USTPUTC(CTLQUOTEEND, out);
1245 state[level].syntax = BASESYNTAX;
1249 case CVAR: /* '$' */
1250 PARSESUB(); /* parse substitution */
1252 case CENDVAR: /* '}' */
1254 ((state[level].category == TSTATE_VAR_OLD &&
1255 state[level].syntax ==
1256 state[level - 1].syntax) ||
1257 (state[level].category == TSTATE_VAR_NEW &&
1258 state[level].syntax == BASESYNTAX))) {
1259 if (state[level].category == TSTATE_VAR_NEW)
1262 USTPUTC(CTLENDVAR, out);
1267 case CLP: /* '(' in arithmetic */
1268 state[level].parenlevel++;
1271 case CRP: /* ')' in arithmetic */
1272 if (state[level].parenlevel > 0) {
1274 --state[level].parenlevel;
1276 if (pgetc() == ')') {
1278 state[level].category == TSTATE_ARITH) {
1280 USTPUTC(CTLENDARI, out);
1286 * (don't 2nd guess - no error)
1293 case CBQUOTE: /* '`' */
1294 out = parsebackq(out, &bqlist, 1,
1295 state[level].syntax == DQSYNTAX &&
1296 (eofmark == NULL || newvarnest > 0),
1297 state[level].syntax == DQSYNTAX || state[level].syntax == ARISYNTAX);
1300 goto endword; /* exit outer loop */
1305 goto endword; /* exit outer loop */
1312 if (state[level].syntax == ARISYNTAX)
1313 synerror("Missing '))'");
1314 if (state[level].syntax != BASESYNTAX && eofmark == NULL)
1315 synerror("Unterminated quoted string");
1316 if (state[level].category == TSTATE_VAR_OLD ||
1317 state[level].category == TSTATE_VAR_NEW) {
1318 startlinno = plinno;
1319 synerror("Missing '}'");
1321 if (state != state_static)
1322 parser_temp_free_upto(state);
1324 len = out - stackblock();
1326 if (eofmark == NULL) {
1327 if ((c == '>' || c == '<')
1330 && (*out == '\0' || is_digit(*out))) {
1332 return lasttoken = TREDIR;
1338 backquotelist = bqlist;
1339 grabstackblock(len);
1341 return lasttoken = TWORD;
1342 /* end of readtoken routine */
1346 * Check to see whether we are at the end of the here document. When this
1347 * is called, c is set to the first character of the next input line. If
1348 * we are at the end of the here document, this routine sets the c to PEOF.
1357 if (c == *eofmark) {
1358 if (pfgets(line, sizeof line) != NULL) {
1362 for (q = eofmark + 1 ; *q && *p == *q ; p++, q++);
1363 if (*p == '\n' && *q == '\0') {
1366 needprompt = doprompt;
1368 pushstring(line, strlen(line), NULL);
1373 goto checkend_return;
1378 * Parse a redirection operator. The variable "out" points to a string
1379 * specifying the fd to be redirected. The variable "c" contains the
1380 * first character of the redirection operator.
1387 np = (union node *)stalloc(sizeof (struct nfile));
1396 np->type = NCLOBBER;
1401 } else { /* c == '<' */
1405 if (sizeof (struct nfile) != sizeof (struct nhere)) {
1406 np = (union node *)stalloc(sizeof (struct nhere));
1410 heredoc = (struct heredoc *)stalloc(sizeof (struct heredoc));
1412 if ((c = pgetc()) == '-') {
1413 heredoc->striptabs = 1;
1415 heredoc->striptabs = 0;
1418 } else if (c == '&')
1428 np->nfile.fd = digit_val(fd);
1430 goto parseredir_return;
1435 * Parse a substitution. At this point, we have read the dollar sign
1445 static const char types[] = "}-+?=";
1446 int bracketed_name = 0; /* used to handle ${[0-9]*} variables */
1452 if (c != '(' && c != '{' && (is_eof(c) || !is_name(c)) &&
1456 } else if (c == '(') { /* $(command) or $((arith)) */
1457 if (pgetc() == '(') {
1461 out = parsebackq(out, &bqlist, 0,
1462 state[level].syntax == DQSYNTAX &&
1463 (eofmark == NULL || newvarnest > 0),
1464 state[level].syntax == DQSYNTAX ||
1465 state[level].syntax == ARISYNTAX);
1468 USTPUTC(CTLVAR, out);
1469 typeloc = out - stackblock();
1470 USTPUTC(VSNORMAL, out);
1479 if (!is_eof(c) && is_name(c)) {
1485 } while (!is_eof(c) && is_in_name(c));
1487 strncmp(out - length, "LINENO", length) == 0) {
1488 /* Replace the variable name with the
1489 * current line number. */
1492 linno -= funclinno - 1;
1493 snprintf(buf, sizeof(buf), "%d", linno);
1498 } else if (is_digit(c)) {
1499 if (bracketed_name) {
1503 } while (is_digit(c));
1508 } else if (is_special(c)) {
1511 if (subtype == 0 && c1 == '#') {
1513 if (strchr(types, c) == NULL && c != ':' &&
1514 c != '#' && c != '%')
1518 if (c1 != '}' && c == '}') {
1533 else if (c == '\n' || c == PEOF)
1534 synerror("Unexpected end of line in substitution");
1545 p = strchr(types, c);
1547 if (c == '\n' || c == PEOF)
1548 synerror("Unexpected end of line in substitution");
1554 subtype = p - types + VSNORMAL;
1560 subtype = c == '#' ? VSTRIMLEFT :
1570 } else if (subtype != VSERROR) {
1574 if (subtype != VSLENGTH && (state[level].syntax == DQSYNTAX ||
1575 state[level].syntax == ARISYNTAX))
1577 *(stackblock() + typeloc) = subtype | flags;
1578 if (subtype != VSNORMAL) {
1579 if (level + 1 >= maxnest) {
1581 if (state == state_static) {
1582 state = parser_temp_alloc(
1583 maxnest * sizeof(*state));
1584 memcpy(state, state_static,
1585 MAXNEST_STATIC * sizeof(*state));
1587 state = parser_temp_realloc(state,
1588 maxnest * sizeof(*state));
1591 state[level].parenlevel = 0;
1592 if (subtype == VSMINUS || subtype == VSPLUS ||
1593 subtype == VSQUESTION || subtype == VSASSIGN) {
1595 * For operators that were in the Bourne shell,
1596 * inherit the double-quote state.
1598 state[level].syntax = state[level - 1].syntax;
1599 state[level].category = TSTATE_VAR_OLD;
1602 * The other operators take a pattern,
1603 * so go to BASESYNTAX.
1604 * Also, ' and " are now special, even
1605 * in here documents.
1607 state[level].syntax = BASESYNTAX;
1608 state[level].category = TSTATE_VAR_NEW;
1613 goto parsesub_return;
1618 * Parse an arithmetic expansion (indicate start of one and set state)
1622 if (level + 1 >= maxnest) {
1624 if (state == state_static) {
1625 state = parser_temp_alloc(
1626 maxnest * sizeof(*state));
1627 memcpy(state, state_static,
1628 MAXNEST_STATIC * sizeof(*state));
1630 state = parser_temp_realloc(state,
1631 maxnest * sizeof(*state));
1634 state[level].syntax = ARISYNTAX;
1635 state[level].parenlevel = 0;
1636 state[level].category = TSTATE_ARITH;
1637 USTPUTC(CTLARI, out);
1638 if (state[level - 1].syntax == DQSYNTAX)
1642 goto parsearith_return;
1645 } /* end of readtoken */
1657 * Returns true if the text contains nothing to expand (no dollar signs
1662 noexpand(char *text)
1668 while ((c = *p++) != '\0') {
1669 if ( c == CTLQUOTEMARK)
1673 else if (BASESYNTAX[(int)c] == CCTL)
1681 * Return true if the argument is a legal variable name (a letter or
1682 * underscore followed by zero or more letters, underscores, and digits).
1686 goodname(const char *name)
1694 if (! is_in_name(*p))
1702 * Called when an unexpected token is read during the parse. The argument
1703 * is the token that is expected, or -1 if more than one type of token can
1704 * occur at this point.
1708 synexpect(int token)
1713 fmtstr(msg, 64, "%s unexpected (expecting %s)",
1714 tokname[lasttoken], tokname[token]);
1716 fmtstr(msg, 64, "%s unexpected", tokname[lasttoken]);
1723 synerror(const char *msg)
1726 outfmt(out2, "%s: %d: ", commandname, startlinno);
1727 outfmt(out2, "Syntax error: %s\n", msg);
1732 setprompt(int which)
1734 whichprompt = which;
1740 out2str(getprompt(NULL));
1746 * called by editline -- any expansions to the prompt
1747 * should be added here.
1750 getprompt(void *unused __unused)
1752 static char ps[PROMPTLEN];
1758 * Select prompt format.
1760 switch (whichprompt) {
1775 * Format prompt string.
1777 for (i = 0; (i < 127) && (*fmt != '\0'); i++, fmt++)
1784 * \h specifies just the local hostname,
1785 * \H specifies fully-qualified hostname.
1790 gethostname(&ps[i], PROMPTLEN - i);
1791 /* Skip to end of hostname. */
1792 trim = (*fmt == 'h') ? '.' : '\0';
1793 while ((ps[i+1] != '\0') && (ps[i+1] != trim))
1798 * Working directory.
1800 * \W specifies just the final component,
1801 * \w specifies the entire path.
1805 pwd = lookupvar("PWD");
1809 *pwd == '/' && pwd[1] != '\0')
1810 strlcpy(&ps[i], strrchr(pwd, '/') + 1,
1813 strlcpy(&ps[i], pwd, PROMPTLEN - i);
1814 /* Skip to end of path. */
1815 while (ps[i + 1] != '\0')
1822 * '$' for normal users, '#' for root.
1825 ps[i] = (geteuid() != 0) ? '$' : '#';
1836 * Emit unrecognized formats verbatim.